Senior Assistant Professor Zhelyazko Stefanov Valchinkov Ph.D

Selection of medium-late and late hybrids. Index selection.

Place of Birth: Kneja, Bulgaria

Secondary Education: Graduated from “Neofit Rilski Secondary School, Kneja (2006

Higher Education:

Bachelor’s degree in Agronomy (2011), University of Forestry, Sofia

Master’s degree in Plant Protection (2012), University of Forestry, Sofia

Academic Degree:

PhD awarded in 2022

Languages:

English (C1 – CEFR)

Russian (A2)

PhD Thesis Title:

“Evaluation of Perennial Cereal Grasses - English Ryegrass, Cocksfoot, Tall and Red Fescues, with Relation of the Selection”

Scientific Interests:

Breeding of medium-late and late maize hybrids

Index and tandem selection

Positions Held:
Academic Positions at Maize Research Institute – Knezha and other academic and research institutions:

Head Assistant (2024)

Assistant (2021–2023)

Managerial and Other Positions at the Maize Research Institute – Knezha:

Project Leader of the postdoctoral project “Development of a New Selection Index in Maize” under the National Programme “Young Scientists and Postdoctoral Researchers – Phase 2”

Governing bodies of other institutions:

Participation in National and International Projects:

  1. ZFTK-4 – “Study on Heterosis, Inheritance of Quantitative Traits of Economic Importance, and Methods for the Development, Improvement, and Identification of New Stress-Tolerant Maize Genotypes”

Project Leader: Assoc. Prof. Dr. Penka Vulchinkova, MRI-Knezha

  1. ZFTK-5 – “Breeding, Variety Maintenance and Seed Production of High-Yielding Maize Hybrids of All Maturity Groups and Utilization Types”

Project Leader: Assoc. Prof. Dr. Valentina Valkova, MRI-Knezha

  1. ZFTK-33 – “Breeding and Seed Production of High-Yielding and Stress-Tolerant Maize Hybrids under Climate Change Conditions – A Basis for Sustainable Agriculture”

Project Leader: Assoc. Prof. Dr. Valentina Valkova, MRI-Knezha

  1. ZFTK-40 – “Catch Crops in Maize Cultivation for Sustainable Agriculture”

Project Leaders: Assoc. Prof. Dr. Lyuba Glogova and Prof. Dr. Viliana Vassileva, MRI-Knezha

  1. National Programme “Young Scientists and Postdoctoral Researchers” – Phase I
    “Development of a New Selection Index in Maize”

Project Leader: Postdoctoral Researcher, Head Assistant Dr. Zhelyazko Vulchinkov, MRI-Knezha

Awards and Distinctions:

  • Gold Cup from the Federation of Scientific and Technical Unions (FNTS), National Exhibition “Creativity and Innovation”, November 28–29, 2023, Union of Inventors in Bulgaria

Main publications:

1. Vulchinkova, P., Savov, V., Chakalov, K., Popova, T., Angelova, G., &Vulchinkov, Z., (2018). Study of inoculants of bioproducts Voodoo Juice and Tarantula influence on the photosynthetic pigments and water regime of two maize hybrids. In Journal of Mountain Agriculture on the Balkans (Vol. 21, Issue 1, pp. 137–147). ISSN 2367-8364 (Online)

2. Katova, A., &Vulchinkov, J., (2019). Variability of morphological characters of collection accessions of perennial ryegrass (Lolium perenne L.). Bulgarian Journal of Agricultural Science, 25(5), 1015–1023

3. S. Vulchinkov, N. Petrovska. Zh. Vulchinkov, V. Valkova (2022). Evaluation of the stability of early maize hybrids by parametric and nonparametric methods. Book of abstracts [p. 64] / XXVth EUCARPIA Maize and Sorghum Conference Current Challenges and New Methods for Maize and Sorghum Breeding, May 30 – June 2, 2022. Belgrade – Serbia

4. Stefan Vulchinkov, Zhelyazko Vulchinkov (2022). Dynamics of grain yield and moisture at harvest and progress observed in an eighteen-year testing of maize hybrids from 4 fao groups. Book of abstracts [p. 63] / XXVth EUCARPIA Maize and Sorghum Conference Current Challenges and New Methods for Maize and Sorghum Breeding, May 30 – June 2, 2022. Belgrade – Serbia

5. Vulchinkov, S., & Vulchinkov, Zh. (2023). Index selection for yield and stability of maize inbred lines and hybrids. Bulgarian Journal of Crop Science, 60 (3) 40-51 (Bg).

6. Vulchnikov, S., Delić, N., Vulchinkov, Z., Pavlov, J., & Petrovska, N. (2024). Stability of Bulgarian maize hybrids tested in Serbia. In Book of proceedings of 15th International Scientific Agriculture Symposium “Agrosym 2024”, Jahorina, 10-13.10. 2024., Bosnia and Herzegovina (pp. 181-189). East Sarajevo: University of East Sarajevo, Faculty of agriculture.

7. Vulchinkov, Zh., (2024). Evaluation of maize hybrids including new selection index. In Journal of Mountain Agriculture on the Balkans. Vol. 27, Issue 6. Pp 149-175.

8. Vulchinkov, S., & Vulchinkov, Zh. (2025). A method for maize hybrids zoning. Bulgarian Journal of Crop Science, 62 (1) 113-121